What SD memory card should I buy with my new digital SLR (DSLR)?
Just bought a Pentax k10d and I am confused with all the choices regarding memory cards. PLEASE HELP! Scan Disk, Transcend, Lexar???
I think I want about 2GB, and of course I don't want to wait 15 seconds between shots from my memory to write. But most of all, I want a good value. I don't need to the fastest product if it's going to cost me an arm and a leg.
Please help me understand memory cards! Thanks!
The short answer is, get a Sandisk Ultra II 2GB card. You might want the faster Extreme III card, but I doubt you would see the difference in regular use. If they cost nearly the same, go ahead and get the Extreme III.
Here's an answer that I wrote for a specific application, but it will be useful to you in your buying decision:
The benchmark of 1X is a transfer rate of 150 KB per second.
I have not encountered a card that was not at least 4X (600 KB per second) and 12X (1.8 MB per second) is now a common speed for an unlabeled card. Compared to 4X, 12X might still be called "high speed" by some manufacturers. 40X is also a common "high speed" card and the transfer rate would be 6 MB per second. That's not too bad for most applications.
Sandisk Ultra II claims a minimum write speed of 60X or 9 MB per second, and a minimum read speed of 66X or 10 MB per second. Sandisk Extreme III claims a minimum write and read speed of 133X or 20 MB per second.
The largest 6MP photos on a D50 camera (for instance) seem to be about 3 MB, so it seems that an Ultra II could save 3 high data images per second, while an Extreme III could save 6 high data images per second. The D50 continuous mode gives up to 2.5 frames per second, so you could be gathering about 8 MB of data per second. If you do not have at least the Ultra II or equivalent, it is easy to see how the D50 bogs down at times.
Once the memory buffer is full, you can not save images any faster than the card can save them and the camera will stop taking pictures until there is space available in the memory buffer. This means you are limited by both the size of the memory buffer and the write speed of the card.
Zeiss DSLR & SLR Lens Assortment for Canon and Nikon
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